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    "# 线性回归的从零开始实现\n",
    ":label:`sec_linear_scratch`\n",
    "\n",
    "在了解线性回归的关键思想之后，我们可以开始通过代码来动手实现线性回归了。\n",
    "在这一节中，(**我们将从零开始实现整个方法，\n",
    "包括数据流水线、模型、损失函数和小批量随机梯度下降优化器**)。\n",
    "虽然现代的深度学习框架几乎可以自动化地进行所有这些工作，但从零开始实现可以确保我们真正知道自己在做什么。\n",
    "同时，了解更细致的工作原理将方便我们自定义模型、自定义层或自定义损失函数。\n",
    "在这一节中，我们将只使用张量和自动求导。\n",
    "在之后的章节中，我们会充分利用深度学习框架的优势，介绍更简洁的实现方式。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "c6f4cd71",
   "metadata": {
    "origin_pos": 2,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "%matplotlib inline\n",
    "import random\n",
    "import torch\n",
    "from d2l import torch as d2l"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "18283191",
   "metadata": {
    "origin_pos": 5
   },
   "source": [
    "## 生成数据集\n",
    "\n",
    "为了简单起见，我们将[**根据带有噪声的线性模型构造一个人造数据集。**]\n",
    "我们的任务是使用这个有限样本的数据集来恢复这个模型的参数。\n",
    "我们将使用低维数据，这样可以很容易地将其可视化。\n",
    "在下面的代码中，我们生成一个包含1000个样本的数据集，\n",
    "每个样本包含从标准正态分布中采样的2个特征。\n",
    "我们的合成数据集是一个矩阵$\\mathbf{X}\\in \\mathbb{R}^{1000 \\times 2}$。\n",
    "\n",
    "(**我们使用线性模型参数$\\mathbf{w} = [2, -3.4]^\\top$、$b = 4.2$\n",
    "和噪声项$\\epsilon$生成数据集及其标签：\n",
    "\n",
    "$$\\mathbf{y}= \\mathbf{X} \\mathbf{w} + b + \\mathbf\\epsilon.$$\n",
    "**)\n",
    "\n",
    "$\\epsilon$可以视为模型预测和标签时的潜在观测误差。\n",
    "在这里我们认为标准假设成立，即$\\epsilon$服从均值为0的正态分布。\n",
    "为了简化问题，我们将标准差设为0.01。\n",
    "下面的代码生成合成数据集。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 69,
   "id": "54efeafe",
   "metadata": {
    "origin_pos": 6,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "def synthetic_data(w, b, num_examples):  #@save\n",
    "    \"\"\"生成y=Xw+b+噪声\"\"\"\n",
    "    X = torch.normal(0, 1, (num_examples, len(w)))\n",
    "    y = torch.matmul(X, w) + b\n",
    "    y += torch.normal(0, 0.01, y.shape)\n",
    "    return X, y.reshape((-1, 1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "1e60261c",
   "metadata": {
    "origin_pos": 8,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "true_w = torch.tensor([2, -3.4])\n",
    "true_b = 4.2\n",
    "features, labels = synthetic_data(true_w, true_b, 1000)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "772256cb",
   "metadata": {
    "origin_pos": 9
   },
   "source": [
    "注意，[**`features`中的每一行都包含一个二维数据样本，\n",
    "`labels`中的每一行都包含一维标签值（一个标量）**]。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "ec13e4f8",
   "metadata": {
    "origin_pos": 10,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "features: tensor([ 0.6566, -0.4879]) \n",
      "label: tensor([7.1724])\n"
     ]
    }
   ],
   "source": [
    "print('features:', features[0],'\\nlabel:', labels[0])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6b8c624b",
   "metadata": {
    "origin_pos": 11
   },
   "source": [
    "通过生成第二个特征`features[:, 1]`和`labels`的散点图，\n",
    "可以直观观察到两者之间的线性关系。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 70,
   "id": "53ef493c",
   "metadata": {
    "origin_pos": 12,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
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   "source": [
    "d2l.set_figsize()\n",
    "d2l.plt.scatter(features[:, 1].detach().numpy(), labels.detach().numpy(), 1);"
   ]
  },
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   "id": "b032f500",
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   "source": [
    "## 读取数据集\n",
    "\n",
    "回想一下，训练模型时要对数据集进行遍历，每次抽取一小批量样本，并使用它们来更新我们的模型。\n",
    "由于这个过程是训练机器学习算法的基础，所以有必要定义一个函数，\n",
    "该函数能打乱数据集中的样本并以小批量方式获取数据。\n",
    "\n",
    "在下面的代码中，我们[**定义一个`data_iter`函数，\n",
    "该函数接收批量大小、特征矩阵和标签向量作为输入，生成大小为`batch_size`的小批量**]。\n",
    "每个小批量包含一组特征和标签。\n"
   ]
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   "cell_type": "code",
   "execution_count": 71,
   "id": "3da34ac6",
   "metadata": {
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    "def data_iter(batch_size, features, labels):\n",
    "    num_examples = len(features)\n",
    "    indices = list(range(num_examples))\n",
    "    # 这些样本是随机读取的，没有特定的顺序\n",
    "    random.shuffle(indices)\n",
    "    for i in range(0, num_examples, batch_size):\n",
    "        batch_indices = torch.tensor(\n",
    "            indices[i: min(i + batch_size, num_examples)]) # 确保即使在最后一个批量中样本数量不足 batch_size 时，也不会报错。\n",
    "        yield features[batch_indices], labels[batch_indices] # 这里的yield是一个生成器, 每次调用才会返回一个结果, 直到没有结果返回"
   ]
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   "source": [
    "通常，我们利用GPU并行运算的优势，处理合理大小的“小批量”。\n",
    "每个样本都可以并行地进行模型计算，且每个样本损失函数的梯度也可以被并行计算。\n",
    "GPU可以在处理几百个样本时，所花费的时间不比处理一个样本时多太多。\n",
    "\n",
    "我们直观感受一下小批量运算：读取第一个小批量数据样本并打印。\n",
    "每个批量的特征维度显示批量大小和输入特征数。\n",
    "同样的，批量的标签形状与`batch_size`相等。\n"
   ]
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  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "1dce0726",
   "metadata": {
    "origin_pos": 17,
    "tab": [
     "pytorch"
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "tensor([[ 0.6476, -1.6279],\n",
      "        [ 0.9641, -0.1388],\n",
      "        [ 0.5520, -1.5467],\n",
      "        [ 1.1875,  0.1445],\n",
      "        [ 1.2915,  0.5079],\n",
      "        [-0.7449, -0.7043],\n",
      "        [-0.3523, -0.3781],\n",
      "        [-0.3588,  0.8530],\n",
      "        [-1.4621, -0.0586],\n",
      "        [ 2.1028, -0.4139]]) \n",
      " tensor([[11.0250],\n",
      "        [ 6.6115],\n",
      "        [10.5489],\n",
      "        [ 6.0797],\n",
      "        [ 5.0586],\n",
      "        [ 5.0909],\n",
      "        [ 4.7748],\n",
      "        [ 0.5727],\n",
      "        [ 1.4870],\n",
      "        [ 9.8218]])\n"
     ]
    }
   ],
   "source": [
    "batch_size = 10\n",
    "\n",
    "for X, y in data_iter(batch_size, features, labels):\n",
    "    print(X, '\\n', y)\n",
    "    break"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d86e62d7",
   "metadata": {
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   "source": [
    "当我们运行迭代时，我们会连续地获得不同的小批量，直至遍历完整个数据集。\n",
    "上面实现的迭代对教学来说很好，但它的执行效率很低，可能会在实际问题上陷入麻烦。\n",
    "例如，它要求我们将所有数据加载到内存中，并执行大量的随机内存访问。\n",
    "在深度学习框架中实现的内置迭代器效率要高得多，\n",
    "它可以处理存储在文件中的数据和数据流提供的数据。\n",
    "\n",
    "## 初始化模型参数\n",
    "\n",
    "[**在我们开始用小批量随机梯度下降优化我们的模型参数之前**]，\n",
    "(**我们需要先有一些参数**)。\n",
    "在下面的代码中，我们通过从均值为0、标准差为0.01的正态分布中采样随机数来初始化权重，\n",
    "并将偏置初始化为0。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 108,
   "id": "12c51289",
   "metadata": {
    "origin_pos": 20,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "w = torch.normal(0, 0.01, size=(2,1), requires_grad=True) # 这里的normal表示生成的数符合正太分布\n",
    "b = torch.zeros(1, requires_grad=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c59d5d68",
   "metadata": {
    "origin_pos": 23
   },
   "source": [
    "在初始化参数之后，我们的任务是更新这些参数，直到这些参数足够拟合我们的数据。\n",
    "每次更新都需要计算损失函数关于模型参数的梯度。\n",
    "有了这个梯度，我们就可以向减小损失的方向更新每个参数。\n",
    "因为手动计算梯度很枯燥而且容易出错，所以没有人会手动计算梯度。\n",
    "我们使用 :numref:`sec_autograd`中引入的自动微分来计算梯度。\n",
    "\n",
    "## 定义模型\n",
    "\n",
    "接下来，我们必须[**定义模型，将模型的输入和参数同模型的输出关联起来。**]\n",
    "回想一下，要计算线性模型的输出，\n",
    "我们只需计算输入特征$\\mathbf{X}$和模型权重$\\mathbf{w}$的矩阵-向量乘法后加上偏置$b$。\n",
    "注意，上面的$\\mathbf{Xw}$是一个向量，而$b$是一个标量。\n",
    "回想一下 :numref:`subsec_broadcasting`中描述的广播机制：\n",
    "当我们用一个向量加一个标量时，标量会被加到向量的每个分量上。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "id": "b8b29b19",
   "metadata": {
    "origin_pos": 24,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "def linreg(X, w, b):  #@save\n",
    "    \"\"\"线性回归模型\"\"\"\n",
    "    return torch.matmul(X, w) + b"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6b7765ef",
   "metadata": {
    "origin_pos": 25
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   "source": [
    "## [**定义损失函数**]\n",
    "\n",
    "因为需要计算损失函数的梯度，所以我们应该先定义损失函数。\n",
    "这里我们使用 :numref:`sec_linear_regression`中描述的平方损失函数。\n",
    "在实现中，我们需要将真实值`y`的形状转换为和预测值`y_hat`的形状相同。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "id": "3dda15c7",
   "metadata": {
    "origin_pos": 26,
    "tab": [
     "pytorch"
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   "outputs": [],
   "source": [
    "def squared_loss(y_hat, y):  #@save\n",
    "    \"\"\"均方损失\"\"\"\n",
    "    return (y_hat - y.reshape(y_hat.shape)) ** 2 / 2"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "56969029",
   "metadata": {
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   "source": [
    "## (**定义优化算法**)\n",
    "\n",
    "正如我们在 :numref:`sec_linear_regression`中讨论的，线性回归有解析解。\n",
    "尽管线性回归有解析解，但本书中的其他模型却没有。\n",
    "这里我们介绍小批量随机梯度下降。\n",
    "\n",
    "在每一步中，使用从数据集中随机抽取的一个小批量，然后根据参数计算损失的梯度。\n",
    "接下来，朝着减少损失的方向更新我们的参数。\n",
    "下面的函数实现小批量随机梯度下降更新。\n",
    "该函数接受模型参数集合、学习速率和批量大小作为输入。每\n",
    "一步更新的大小由学习速率`lr`决定。\n",
    "因为我们计算的损失是一个批量样本的总和，所以我们用批量大小（`batch_size`）\n",
    "来规范化步长，这样步长大小就不会取决于我们对批量大小的选择。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "id": "8f92242d",
   "metadata": {
    "origin_pos": 29,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "def sgd(params, lr, batch_size):  #@save\n",
    "    \"\"\"小批量随机梯度下降\"\"\"\n",
    "    with torch.no_grad():\n",
    "        for param in params:\n",
    "            param -= lr * param.grad / batch_size  # param.grad 并不是在计算梯度，而是存储梯度, 这里的作用是在更新参数\n",
    "            param.grad.zero_()  # 在pytorch中梯度是累加的, 这里不清零, 会导致计算的梯度有问题"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "89067f86",
   "metadata": {
    "origin_pos": 32
   },
   "source": [
    "## 训练\n",
    "\n",
    "现在我们已经准备好了模型训练所有需要的要素，可以实现主要的[**训练过程**]部分了。\n",
    "理解这段代码至关重要，因为从事深度学习后，\n",
    "相同的训练过程几乎一遍又一遍地出现。\n",
    "在每次迭代中，我们读取一小批量训练样本，并通过我们的模型来获得一组预测。\n",
    "计算完损失后，我们开始反向传播，存储每个参数的梯度。\n",
    "最后，我们调用优化算法`sgd`来更新模型参数。\n",
    "\n",
    "概括一下，我们将执行以下循环：\n",
    "\n",
    "* 初始化参数\n",
    "* 重复以下训练，直到完成\n",
    "    * 计算梯度$\\mathbf{g} \\leftarrow \\partial_{(\\mathbf{w},b)} \\frac{1}{|\\mathcal{B}|} \\sum_{i \\in \\mathcal{B}} l(\\mathbf{x}^{(i)}, y^{(i)}, \\mathbf{w}, b)$\n",
    "    * 更新参数$(\\mathbf{w}, b) \\leftarrow (\\mathbf{w}, b) - \\eta \\mathbf{g}$\n",
    "\n",
    "在每个*迭代周期*（epoch）中，我们使用`data_iter`函数遍历整个数据集，\n",
    "并将训练数据集中所有样本都使用一次（假设样本数能够被批量大小整除）。\n",
    "这里的迭代周期个数`num_epochs`和学习率`lr`都是超参数，分别设为3和0.03。\n",
    "设置超参数很棘手，需要通过反复试验进行调整。\n",
    "我们现在忽略这些细节，以后会在 :numref:`chap_optimization`中详细介绍。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 106,
   "id": "9163db58",
   "metadata": {
    "origin_pos": 33,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [],
   "source": [
    "lr = 0.03\n",
    "num_epochs = 3\n",
    "net = linreg\n",
    "loss = squared_loss"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 109,
   "id": "ad5c2cd1",
   "metadata": {
    "origin_pos": 35,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "epoch 1, loss 0.028767\n",
      "epoch 2, loss 0.000107\n",
      "epoch 3, loss 0.000048\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "epoch 3, loss 0.000051\n"
     ]
    }
   ],
   "source": [
    "for epoch in range(num_epochs):\n",
    "    for X, y in data_iter(batch_size, features, labels):\n",
    "        l = loss(net(X, w, b), y)  # X和y的小批量损失\n",
    "        # 因为l形状是(batch_size,1)，而不是一个标量。l中的所有元素被加到一起，\n",
    "        # 并以此计算关于[w,b]的梯度\n",
    "        l.sum().backward() # 这里是在求和之后再求的导数,         从这里也可以看出来为什么要求和, 求损失就是要求和\n",
    "        sgd([w, b], lr, batch_size)  # 使用参数的梯度更新参数\n",
    "    with torch.no_grad():  # 这里为什么要禁用梯度, 就是因为, 梯度只有在反向传播的时候才会使用\n",
    "        train_l = loss(net(features, w, b), labels)  # 前面训练, 梯度下降的时候, 是从features里取出一部分, 这里计算损失的时候是计算的整个的\n",
    "        print(f'epoch {epoch + 1}, loss {float(train_l.mean()):f}')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "427d8cda",
   "metadata": {
    "origin_pos": 38
   },
   "source": [
    "因为我们使用的是自己合成的数据集，所以我们知道真正的参数是什么。\n",
    "因此，我们可以通过[**比较真实参数和通过训练学到的参数来评估训练的成功程度**]。\n",
    "事实上，真实参数和通过训练学到的参数确实非常接近。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "id": "a4c3d525",
   "metadata": {
    "origin_pos": 39,
    "tab": [
     "pytorch"
    ]
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "w的估计误差: tensor([4.8757e-05, 5.5170e-04], grad_fn=<SubBackward0>)\n",
      "b的估计误差: tensor([0.0001], grad_fn=<RsubBackward1>)\n"
     ]
    }
   ],
   "source": [
    "print(f'w的估计误差: {true_w - w.reshape(true_w.shape)}')\n",
    "print(f'b的估计误差: {true_b - b}')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9f3d71ee",
   "metadata": {
    "origin_pos": 40
   },
   "source": [
    "注意，我们不应该想当然地认为我们能够完美地求解参数。\n",
    "在机器学习中，我们通常不太关心恢复真正的参数，而更关心如何高度准确预测参数。\n",
    "幸运的是，即使是在复杂的优化问题上，随机梯度下降通常也能找到非常好的解。\n",
    "其中一个原因是，在深度网络中存在许多参数组合能够实现高度精确的预测。\n",
    "\n",
    "## 小结\n",
    "\n",
    "* 我们学习了深度网络是如何实现和优化的。在这一过程中只使用张量和自动微分，不需要定义层或复杂的优化器。\n",
    "* 这一节只触及到了表面知识。在下面的部分中，我们将基于刚刚介绍的概念描述其他模型，并学习如何更简洁地实现其他模型。\n",
    "\n",
    "## 练习\n",
    "\n",
    "1. 如果我们将权重初始化为零，会发生什么。算法仍然有效吗？\n",
    "1. 假设试图为电压和电流的关系建立一个模型。自动微分可以用来学习模型的参数吗?\n",
    "1. 能基于[普朗克定律](https://en.wikipedia.org/wiki/Planck%27s_law)使用光谱能量密度来确定物体的温度吗？\n",
    "1. 计算二阶导数时可能会遇到什么问题？这些问题可以如何解决？\n",
    "1. 为什么在`squared_loss`函数中需要使用`reshape`函数？\n",
    "1. 尝试使用不同的学习率，观察损失函数值下降的快慢。\n",
    "1. 如果样本个数不能被批量大小整除，`data_iter`函数的行为会有什么变化？\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "193224b1",
   "metadata": {
    "origin_pos": 42,
    "tab": [
     "pytorch"
    ]
   },
   "source": [
    "[Discussions](https://discuss.d2l.ai/t/1778)\n"
   ]
  }
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